rambler.... if you don't mind, I'll jump in on your question.
Pat's has an option $20.00 spreader bar that can be used to hold the lower links at whatever width you need them. I bought it. I found with use, I didn't need it, and it is still in the box. But if anyone wants one I might be willing... and it would actually be very useful if all your implements had the same size "A" frame, becuase then you could just leave it on and leave it set for that size, I don't have that.
Seriously, the lower links do move around a bit but what I have found is that I back up to the implement, get off, line up the lower links, and then simply back up the rest of the way, or if I'm alread there, just lift the rear hydrualics and the lower links have never missed the implement yet.
You have to remember, on the Pat's system, the operator still has to get off the tractor and connect up the top link. That is one of the main disadvantages of the Pat's system, you cannot just back up, lift and go, even if you have a simple attachement like a blade that does not require a PTO shaft. Obviously anything that uses a PTO shaft requires the operator to get off and connect it up on any of the Quick Hitch systems. But the Pat's system requires the top link ot be connected too. The trade off to that is that Pat's works with pretty much any implement that can be imagined from the often cursed at PHD to standard width implements to extra narrow or extra wide implements.
The other thing that attacted me to Pat's system is that I share implements with a neighbor, many of the other systems would require an adapter to be installed on each implement, which would require me to convince him to spend his money for a system for his tractor and his implements.
So FOR ME, Pat's works well. But as I said before, IF it was not for my particular situation, I might have chosen something more like the Delta Hook, or some of the other brands that have male/female connectors, or more likely I would have a quick hitch system like they sell at TSC or Northern.